4. Reflects Common Units held directly by KA First Reserve, LLC ("KA First Reserve"). FR Midstream Holdings LLC ("FR Midstream Holdings") owns a majority of the membership interests in KA First Reserve and controls the board of managers of KA First Reserve.

5. Gas Services Holdings' sole member is Crestwood Holdings, whose sole member is FRCM Co-Investment, whose controlling member is Crestwood Holdings Partners, LLC, whose controlling member is FR XI CMP Holdings LLC, whose sole member is FR Midstream Holdings, whose manager is First Reserve GP XI, L.P., whose general partner is First Reserve GP XI, Inc. ("FR GP Inc."). William E. Macaulay is a director of FR GP Inc. and has the right to appoint a majority of the board of directors of FR GP Inc.

6. Does not include 438,789 Subordinated Units. The Subordinated Units may be converted into Common Units on a one-for-one basis upon the termination of the subordination period as set forth in the Issuer Partnership Agreement.

7. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $20.17 to $21.16, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

8. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $21.17 to $21.55, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

9. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $19.70 to $20.69, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

10. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $20.70 to $21.34, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

Remarks:

The Reporting Persons disclaim beneficial ownership of the securities reported on this Form 4 except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of these securities for purposes of Section 16 of the Securities Exchange Act of 1934 or for any other purpose.